lockuninit()

[Matthew Dillon]

:It appears we don't have an uninit function for lockmgr locks. This means we 
:don't ever uninit the embedded spinlock (which does have a dummy 
:spin_uninit()) and this defeats the idea of providing spin_uninit(). There is 
:no purpose in having a dummy function that isn't used consistently; anybody 
:who wants to add debugging/verification code will be forced to go through 
:the source to add the missing calls or, worse yet, not even notice they are 
:missing.
:
:I'm attaching a trivial (completely untested) lockuninit() implementation. 
:There are (grep tells me) 17 non-static uses of struct lock to check, so this 
:is only a first step, but I can't go through the tree changing things right 
:now.
:
:Aggelos

    I'll commit it so we have it. 

    I'm a bit on the fence as to whether we actually need the uninit
    functions for lockmgr locks or spin locks.  They might be useful for
    debugging purposes but that's about it.  Our lock use isn't as complex
    as FreeBSD's.

						-Matt